Governor



April 4, 1961 T. F. CRAMER 2,977,945

GOVERNOR Filed Feb. 2, 1959 5 Sheets-Sheet 1 INVENTOR.

(9 THOM F. GRAMER BY 1 M TTORNEYS April 4, 1961 T. 'F. CRAMER 2,977,945

GOVERNOR Filed Feb. 2, 1959 3 Sheets-Sheet 2 INVENTOR. THOMAS F. CRAMERBY i y N a y ATTORNEYS April 4, 1961 T- F. CRAMER GOVERNOR 3Sheets-Sheet 3 Filed Feb. 2, 1959 INVENTOR.

ATTORNEYS plete the governing action.

GOVERNOR Filed Feb. 2, 195?, Ser. 796,553

23 Claims. (U. 123 103) The present invention relates to improvements ina governor for the speed control of an internal combustion engine, inparticular an engine employing a multiple stage carburetor system. Theimprovement enables an instantaneous response of the governor inregulating speed through the entire governor unloading range, under thesuccessive but independent control actions of venturi and manifoldvacuum. I

Vacuum responsive governors heretofore employed or proposed operate ingeneral on one or another of the theories that venturi vacuum aloneshould be used to accomplish the governing action, that manifold vacuumalone should be used, or that venturi and manifold vacuum should beintercommunicated and used in combination, so as to create a so-calledgovernor vacuum, which in turn is applied to a diaphragm or like vacuumresponsive unit in order to accomplish the governing action.

The present invention provides a governor in which venturi vacuum isemployed by itself to start the governing action, and in which manifoldvacuum, isolated during all times, from the venturi vacuum, serves tocomried out quite independently of the other. This, in general, isforthe reason that venturi vacuum alone does not suffice to operate thegovernor over the entire governing range. Hence, the inventioncontemplates its supplementation by independent manifold vacuum in thespread of the range in which the venturi source is insuificient for thepurpose.

It is a general object of ,the invention to provide an improvedgovernor, separately sensitive to venturi and manifold vacuum effects asdescribed, in which, in one embodiment, the independent application ofthese elfects to a vacuum responsive unit is controlled by a suitablevalve, such as a spool type, acting in conjunction with an improvedcentrifugal spinner valve. In another embodiment the improvementinvolves a system featuring conjointly acting diaphragm sub-assembliescoupled with the spinner valve to accomplish an independent, stagedapplication of the two sources of vacuum.

In further explanation of the above, a multiple stage carburetion systemcomprises an operator-controlled .prirnary throttle plate assembly and aventuri vacuum vacuum lines connected to both the venturi and manifoldvacua. However, in an engine in which vacuum available for governorcut-otf is not particularly great, the. higher venturi vacuum is reducedby the bleeding effect of the manifold pickup; and it is therefore more;difiicult to govern successfully at the lower engine speeds without theuse of a vacuum pump.

States Patent Each of these effects is car It is therefore anothergeneral object of the invention. to provide improvements in a governorsystem, offtlie; type employing pick-ups located both. at the venturiand below the carburetor throttle (for manifold vacuum), in which thetwo vacuum effects are ap liedin dependently, and without in any degreebleeding intq. each other. This is done through the agency and con; trolof an improved dual spinner valve which isolates the two vacuum sourcesfrom one another. Thegoyf' ernor is thus independently responsive toengine load and speed conditions to adjust a control member of theengine, herein shown as a throttle plate of the carburetor.

Each pick-up line, venturi and manifold, is in effect, equipped with itsown speed-sensitive spinner valve. As shown, these valves are on thesameshaft and driven identically. They are, however, entirely independentof,each other as far as air bleeding and vacuum control. are concerned,coming into vacuum cut-in and cut-out.

range.

Another object is to provide a dual spinner valve type 7 control which,under the regulation of a suitable further;

valve, may apply vacuum to a single diaphragm unity to eifect, thegoverning action, or which may be associated, with independent diaphragmunits, each responsive one of two spinner valves of the spinner unit.

More generally, it is an object of the invention to. provide a fullrange governor control, responsive to the independent effects of venturivacuum and manifol vacuum, in which a governor speed spread ofregulation to'any desired amount can be obtained. This is possi blebecause in both the unloading or loading actions of both or either ofthe venturi and manifold vacuum con: trol operations the regulation canbe as sharp or as broad as may be obtained by simple adjustments in rogard to selection of spring rates, mechanical adjusting.

ings, illustrating preferred embodiments of the invention;

wherein:

Fig. 1 is a side elevational view of a four-barrel carburetor providedwith a governor embodying the in; vention, with portions shownschematically, as well asin: vertical cross section; Fig. 2 is aschematic type of view of an application, of one embodiment of theinvention, involving thefuse. of the improved spinner valve, shown inaxial .sec'tioihi With a control valve (also sectioned) to operate asingle, diaphragm assembly; and Fig. 3 is a similar schematic viewillustrating another. adaptation in which two independent diaphragmassei'n? blies are employed.

Referring first to Fig. l, a four-barrel carburetor 10,-. of the typereferred to above and having an air intake;

12, is sectioned to expose one of the primary barrels, 14 and one of thesecondary barrels 16. The primaryi barrel 14 is provided with arestriction. or venturi. throat; 1S and a conventionally operatedthrottle plate 20 moii 't-I ed on'the shaft 22 which extends through theother, prii-f mary barrel in which is mounted a throttle plate identicalto plate 20. The secondary barrel 16 is als'opr'ovided. with a venturithroat 24 and a throttle plate 26 mountedv on the shaft 28 which extendsthrough the othersec oiidary barrel in which is mounted anothersecondary, p t v v "While a particular four-barrel carburetor which isin, the main conventional is shown for purposes of illus;

tration, it will be apparent that the invention is equally applicable toany single or multi-stage carburetor. The carburetor being conventional,a general description of its structure and its governed operation willsuflice. The reference numeral 11 generally designates the improved dualacting spinner valve of the invention, details of which appear in Fig.2.

A vacuum type governor diaphragm assembly or device 30 is mounted on oneside of a carburetor throttle body 34 of carburetor 10. To this end afurther body 36, preferably being a casting providing upper and lowerrecesses 38 and 40, is secured to body 34. Recess 40 has a bottom wallconstituted by a flexible diaphragm 42 suitably secured to the body 36and defining a chamber 46, of which the flexible diaphragm 42 forms anupper wall. V

The diaphragm 42 has a rod 48 secured to the center thereof inconventional manner, the rod passing through a vertical bore or passage50 in the body 36 and being pivoted atits top to a lever 54 secured onan end of the primarythrottle shaft.22, which end extends into thechamber 38. A tension spring 58 tends to bias-the shaft 22 and primarythrottle plate 20 to the open position. A cover plate 66 has an openingventing the chamber 38 to the atmosphere.

The operation of the improved governor involves the use of an orifice 72at the primary venturi 18 and a pair of orifices 74, 75, below theprimary throttle plate 20. These three orifices arerespectivelyconnected by passages 76, 76', 76", each having a fixed restriction .77,with vacuum lines or conduits (to be described) which communicate thesame with the improved spinner valve 11 of the invention, as well aswith a control valve (in the embodiment under consideration), whichcontrol valve is generally designated 120 and will be hereinafterdescribed. Passages 84 and 86 in the body and cover members 36, 44 leadfrom the chamber 46 through the clamped periphery of diaphragm to anexternal threaded fitting 90. Fitting 90 is connected by a vacuum tubeor line 91 with the control valve 120 of the invention, hereinafterdescribed in detail.

In the type of carburetor control chosen for illustration, a secondarythrottle diaphragm assembly 92 is mounted at the opposite side of thecarburetor throttle body 34 from the governor diaphragm assembly 30.Assembly 92 comprises a body 94 having a recess vented to the atmospherethrough an apertured plate 95 secured to the body 94. The lower portionof body 94 receives a flexible diaphragm 96 which is secured tothe body94 by means of a cover 98, the diaphragm 96 providing a flexible wallseparating oppositely disposed chambers 100 and 102 in the assembly 92.A rod 104 is secured to the center of the diaphragm 96, extendingupwardly through a bore 106 in body 94, and a coil spring 108 in chamber102 urges the rod 104 and diaphragm 96 upwardly. Rod 104 is pivoted on alever 110 secured to the secondary throttle shaft 28, and so urgedupwardly it biases shaft 28 in a direction to close the secondarythrottle plates 26.

A conduit 111 extends between the chamber 102 and the primary andsecondary venturis 18 and 24, and enables primary and/or secondaryventuri vacuum to evacuate the chamber 102 and displace the diaphragm 96downwardly to open the secondary throttle 26. The force of the spring108 is selected so that the secondary throttle plate 26 will open at anypredetermined venturi vacuum.

An air supply conduit or tube 118 connects from the carburetor intake 12to the spinner valve assembly 11 for a purpose to be described.

It is now in order to refer to Fig. 2 of the drawings for details of theimproved dual-acting spinner valve unit 11, as operated in associationwith the control valve 120 to isolate venturi vacuum from manifoldvacuum; 1n accordance with the embodiment of the invention underconsideration. Valve is shown as a simple spool type by which thetransition of control by spinner valve 11, as between the vacuum effectat the venturi, alone, and at the manifold, alone, is brought about andregulated automatically.

As illustrated in Fig. 2, the spinner valve 11 includes a suitablyclosed housing or casing 121 provided with air openings 122 .in a wallthereof, one of which openings is equipped with a fitting 123 (Fig. l)to which the air intake line or conduit 118 from the carburetor intake12 is connected. Housing 121 is suitably supported in fixed position onthe engine by means not shown.

The housing 121 also has an axial opening 124 in a boss 124 at itsbottom threaded to receive a fitting 125, through which fitting theopening 124 is communicated by a bleedcr line 126 with the control valve120 and, under control of the latter, with the line or conduit 91leading through passages 84, 86 to diaphragm chamber 46. Manifold vacuumapplied through orifice '4, passage 76' and a connecting line 127 isadapted to be bled by line 126 under the control of spinner valve 11,the lines 126, 127 having a common connection into a further conduit 128leading to control valve.

The housing of spinner valve 11 has a further tubular top boss 130 towhich a radial fitting 131 is applied and a second venturi vacuum bleedline 132 connects this fitting with venturi orifice 72, through the bodypassage 76 of that orifice. A common connection of these lines extendsthrough a conduit 133 to the control valve 120; and another line orconduit 134 connects the valve, at a point opposed to conduit 133, withthe diaphragm chamber 46 of assembly 30.

Finally, operating vacuum is applied to control valve 120 through aconduit 135 connecting the latter, in a manner to be described, with thebelow-throttle manifold vacuum orifice 75 and its passage 76".

Spinner valve 11 internally comprises an upright shaft 136, of hollowtubular section at its ends, suitably journalled in the bottom and tophousing bosses 124, 130: and shaft 136 is driven at a top connection inaccordance with engine or vehicle speed, in a known manner.

A pair of hollow tubular centrifugal weight rods or stems 137, 138extend radially through the shaft, being equipped at their midpointswith similar radial ports 139.

The respective ports 139 communicate with the interior of the shaft 136below and above the respective rods 137, 138, hence with the manifoldvacuum bleed line or conduit 126 and the venturi vacuum bleed line orconduit 132, respectively. It is to be clearly understood that the lines126, 132 otherwise have no connection with one another, and that thevalving actions at the respective rods 137, 138 (to be described) areindependent of one another in their successive cut-in, intermediateregulation and cut-out of venturi and manifold vacuum, and vice versa.The rods 137, 138 are sealed and stopped at their outer ends, as byplugs 140.

A weight 141 is mounted to slide outwardly on lower rod 137 undercentrifugal force, in opposition to a coil spring 142 acting between itand the end abutment 143 on rod 137; and rod 137 is provided with aradial valve bleed port 144 adapted to be restricted by weight 141 inthis movement. Thus, as governed speed is approached and reached, theweight 141 passes onto valve port 144, progressively cutting 011 the airbleed effect from intake 12 on the interior of the rod and on manifoldvacuum-connected conduit 126.

Similarly, the upper centrifugal weight rod 138 has a radial valve bleedport 148 correspondingly restricted progressively as a centrifugalweight 147 on rod 138 travels outwardly against the force of a coilspring 146 acting between it and an abutment 149 on rod 138.

The sequencing action of this improved dual spinner valve 11 will beexplained at a later point; and it is evident that although the dualspinner shown herein em bodies two different, axially spaced and tubularweight munication therethrough of the vacuum responsive assembly 30 andthe manifold and venturi vacuum bleed lines 126, 132, respectively.

Now referring again to Fig. 2 in conjunction with Fig. 1, the spool typecontrol valve unit 120 has the function of successively sequencing thedesired cut-ofi and cut-in of air bleeding action, i.e., on venturivacuum acting on diaphragm 42 of assembly 30 through the centrifugal rod138 and lines 133 and 134, and on manifold vacuum acting through rod 137and'line 126, in an independent y- Valve 120 (Fig. 2) comprises anappropriate block-like body 162 suitably mounted on the engine andhaving a horizontal axial bore 163 of uniform cylindrical outline, thisbore opening at the right hand end of the body 162, as viewed in Fig. 2,to an enlarged vacuum chamber 164. A set screw 162' is threaded throughthe left hand end of body 162 to extend axially into the bore 163 andact as an adjustable limiting stop for a valve plunger 165 which isslidable in the bore.

At its right hand end, the plunger 165 extends into the chamber 164 andhas secured thereto a flexible diaphragm 166 responsive to manifoldvacuum applied to the chamber through line 135. A coil spring 167 actsbetween the diaphragm and an adjustable set screw 168 threaded axiallyinto the right hand end of body 162, thereby enabling the force ofspring 167 to be adjusted.

The body 162 is provided with a plurality of radial passages, eachadapted to receive a fitting (not shown) by 'which the passagescommunicate the valve bore 163 with the exterior of valve unit 120.

These passages include a passage 169 communicated by the line or conduit128 with the bleed line 126 and through line 127 with manifold vacuum atorifice 74; a

passage 171 directly opposed radially to the passage 169 and adapted tobe communicated through the line 91 with the diaphragm space or chamber46 in the diaphragm assembly 30; a passage 174 axially spaced from thepassage 169 and adapted to be communicated through the line or conduit133 with the spinner valve bleed line 132 as well as with venturi vacuumat the orifice 72; and a passage 176 radially opposed to the passage 174and adapted to be communicated through the line or conduit 134 with thediaphragm chamber 46 of assembly 30,,in the same way that the line 91is. Y V

The valve plunger 165 is, in the main, of uniform cylindrical crosssection, but is formed between its ends to provide two grooves, one anannular groove 179 adapted to communicate radial body passages 174 and176 with one another, when the plunger 165 is in the position of Fig. 2,and the other an annular groove 186 adapted to communicate the passages169 and 171 with one another, when the plunger is urged to the rightagainst the force of spring 167 under manifold vacuum applied to thechamber 164. Such vacuum is applied from manifold pick-up orifice 75through the line or conduit 135, which communicates with chamber 164through a radial opening 181. s

In the operation of the above system, full advantage is taken of theability to employ high venturi vacuum or cut-off, supplemented bymanifold vacuum. As the engine comes up to governed speed, the upperweight 147 moves centrifugally outwardly against the force of spring 146until it begins to cover the valve port 148 in its rod 138. This allowsthe vacuum available from venturi port or orifice 72 through line 133 toincrease, the bleeding effect through line 132 being decreased.

At this point, the valve plunger 165 of valve unit 129 is in theposition shown in Fig. 2, communicating radial passages 174, 176 throughplunger groove 179, and allowing vacuum to increase in diaphragm chamber46 and effect cut-oif by swinging throttle plate 20 towards closingposition. i i I As this occurs, air is entering the valve bleed port 144of the lower centrifugal weight rod 13 7,'thu's' reducing vacuum fromthe pick-up at orifice 74 through line or conduit 128. However, thisvacuum is prevented from acting upon throttle control diaphragm 42 dueto the blocking of communication between passages, 169 and 171 by thecenter portion of valve plunger 165.

Venturi vacuum alone is not sufficient to control the governor over thefull unloading range, since the force required to close the throttle isincreasing as venturi vacuum decreases due to reduced air flow.Therefore, in accordance with the invention, manifold vacuum is employedfor this part of the unloading; and the application of such vacuum tothe diaphragm 42 is accomplished through control valve 120.

To this end, manifold vacuum from the pick-up orifice 75 is communicatedthrough line 135 and chamber opening 181 with the vacuum chamber 164 ofcontrol valve 120, causing its diaphragm 166 to move to the rightagainst the opposition of spring 167. As the diaphragm is thus moved tothe right, it moves the plunger 165 in the same direction, interruptingcommunication of venturi vacuum passages 174, 176 and openingcommunication of manifold vacuum passages 169, 171 through the an nulargroove 186 in plunger 165. Manifold vacuum then accomplishes theremainder of the unloading over the governed range. As the lower weight141'rnoves outwardly against spring 142, its position over bleed port144 of lower rod 137 adjusts manifold vacuum from pickup orifice 74 to avalue'in diaphragm chamber'46 of assembly 30 suitable to allow theremainder of the unloading to take place.

It is seen from the above that by making the venturi vacuum and manifoldvacuum independent of each other it is possible to obtain a governorspeed spread or regulation in any desired amount, and that simpleadjustments, as in regard to chosen spring rates, setting of adjustingdevices, selection of stem hole and restriction sizes, and the like,enable any part of the unloading or loading action to be made as sharpor broad as is desired.

Initial loading of the control valve plunger spring 167 is determined bythe setting of the adjusting set screw 168; and the point of transition,atwhich control by venturi vacuum is transferred to control by manifoldvacuum, may be set as desired by adjusting set screw 168. The oppositeset screw 162' limits movement of plunger 165 by spring 167 to theposition in which communication of passages 174 and 176 is established.

If desired, of course, all or any part of the structure shown herein maybe incorporated into a single, compact carburetor unit adapted forplacement in a vehicle engine compartment.

Fig. 3 of the drawings very schematically illustrates a modification ofthe invention wherein venturi vacuum and manifold vacuum areindependently employed, through independent bleed control by a spinnervalve11 identical to the one described above, but without resort to asequencing control valve like the valve of the embodiment of Figs. 1 and2. As in that form, under no situation is manifold vacuum bled through aventuri port, or vice versa.

The system of Fig. 3 operates identically to that of Figs. 1 and 2, savefor the fact that manifold and venturi vacuum are isolated from oneanother by the use of' a further diaphragm assembly identical to theassembly 30, hence indicated, and having its parts indicated, bycorresponding reference numerals, primed.

In this installation, the line 133 communicating with venturi orifice 72and the spinner valve bleed line 132 is connected directly to thechamber '46 of the diaphragm assembly 30, rather than to any sort ofsequencing control valve. Similarly the line 127 fron 'th'e manifoldvacuum orifice 74 is brought, as througha; connector conduit length 180,to the corresponding chamber 46' of the second diaphragm assembly 30'.The bleed line 126 to spinner valve 11 is correspondingly connected withthe chamber 46' through the length 180.

As schematically shown in Fig. 3, and for simplicity of illustration,the throttle plate 20 has its operating lever or arm 54 connected, as bya link 182 and common pivot 183, to the actuating rods 48, 48 of therespective assemblies 30, 30', for independent operation by eitherthereof. A conventional, dotted line gang representation indicates theactual pivoting of these rods to a single arm or lever 54.

Thus, venturi and manifold vacuum are successfully employed over theentire governing range for independent operation of the governor inresponse to engine speed and load, as in the embodiment first described.It will be perceived by those skilled in the art that, thoughillustrated as applied to a governor associated with an enginecarburetor, the principles of the invention are also well suited forapplication to other types of fuel control devices.

The drawings and the foregoing specification constitute a description ofthe governor in such full, clear, concise and exact terms as to enableany person skilled in the art to practice the invention, the scope ofwhich is indicated by the appended claims.

What I claim as my invention is:

1. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means having conduit means operativelyconnecting the same between said respective vacuum sources and saidvacuum responsive means for the independent application of saidrespective vacua to the latter, whereby to operate said control memberby said vacuum responsive means in response to venturi vacuum andmanifold vacuum, independently of one another.

2. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means including a centrifugal valve devicedriven in accordance with engine speed and having conduit meansoperatively connecting the same independently between said respectivevacuum sources and said vacuum responsive means for the independentapplication of said respective vacua to the latter, whereby to operatesaid control member by said vacuum responsive means in response toventuri vacuum and manifold vacuum, independently of one another.

3. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means including a centrifugal valve devicedriven in accordance with engine speed and having conduit meansoperatively connecting the same independently between said respectivevacuum sources and said vacuum responsive means for the independentapplication of said respective vacua to the latter, whereby to operatesaid control member by said vacuum responsive means in response toventuri vacuum and manifold vacuum, independently of one another, saidvalve device comprising centrifugally urged valve members controllingcommunication of said vacuum responsive means with said respectivesources.

4. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means including a centrifugal valve devicedriven in accordance with engine speed and having conduit meansoperatively connecting the same 8 independently between said respectivevacuum sources and said vacuum responsive means for the independentapplication of said respective vacua to the latter, whereby to operatesaid control member by said vacuum responsive means in response toventuri vacuum and manifold vacuum, independently of one another, saidvalve device isolating said sources from one another and comprisingcentrifugally urged valve members controlling communication or" saidvacuum responsive means with said respective sources.

5. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means including a centrifugal valve devicedriven in accordance with engine speed and having conduit meansoperatively connecting the same independently between said respectivevacuum sources and said vacuum responsive means for the independentapplication of said respective vacua to the latter, whereby to operatesaid control member by said vacuum responsive means in response toventuri vacuum and manifold vacuum, independently of one another, saidvalve device isolating said sources from one another and comprisingcentrifugally urged valve members controlling communication of saidvacuum responsive means with said respective sources, said valve membersbeing mounted for rotation on a common axis.

6. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means including a centrifugal valve devicedriven in accordance with engine speed and having conduit meansoperatively connecting the same independently between said respectivevacuum sources and said vacuum responsive means for the independentapplication of said respective vacua to the latter, whereby to operatesaid control member by said vacuum responsive means in response toventuri vacuum and manifold vacuum, independently of one another, saidvalve device isolating said sources from one another and comprisingcentrifugally urged valve members controlling communication of saidvacuum responsive means with said respective sources, said valve membersbeing mounted for rotation on a common axis and having valve portsrotating therewith and controlled thereby under centrifugal action.

7. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive I means operatively connected to said control memberto adjust the latter, and valve means having conduit means operativelyconnecting the same between said respective vacuum sources and saidvacuum responsive means for the independent application of saidrespective vacua to the latter, whereby to operate said control memberby said vacuum responsive means in response to venturi vacuum andmanifold vacuum, independently of one another, said vacuum responsivemeans comprising means providing a vacuum chamber, and a control valveto control communication of one or the other of said sources with saidchamber.

8. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means having conduit means operativelyconnecting the same between said respective vacuum sources and saidvacuum responsive means for the independent application of saidrespective vacua to the latter, whereby to operate said control memberby said vacuum responsive means in response to venturi vacuum andmanifold vacuum, independently of one another, said vacuum responsivemeans comprising means providing a vacuum chamber, and a control valvein said savages conduit means movable in response to one of said vacuato'control communication of one or the other of said sources with saidchamber. l i

- 9. A governor for the control of an engine having an adjustablecontrol member and sources of venturi vacuum and manifold vacuum,comprising vacuum responsive means operatively connected to said controlmember to adjust the latter, and valve means having conduit meansoperatively connecting the same between said respective vacuum sourcesand said vacuum responsive means for the independent application of saidrespective vacua to the latter, whereby to operate said control memberbysaid vacuum responsive means in response to venturi vacuum and manifoldvacuum, independently of one another, said vacuum responsive meanscomprising means providing a vacuum chamber, a control valve in saidconduit means movable in response to one ofsaid'vacua to controlcommunication of one or the other of said sources with said chamber,said valve means comprising a centrifugally responsive valve device insaid conduit means communicated with said chamber and said respectivevacuum sources under the control of said control valve.

10. A governor for the control of an engine having an adjustable controlmember and sources of venturi vacuum and manifold vacuum, comprisingvacuum responsive means operatively connected to said control member toadjust the latter, and valve means having conduit means operativelyconnecting the same between saidrespective vacuum sources and saidvacuum responsive means for the independent application of saidrespective vacua to the latter, whereby to operate said control memberby said vacuum responsive means in response to venturi vacuum andmanifold vacuum, independently 'of one another, said vacuum responsivemeans comprising a pair of independent vacuum chambers, and acentrifugally responsivevalve device to independently communicate saidchambers with said respective vacuum sources.

11. Control structure for an engine governor responsive to enginemanifold vacuum and venturi vacuum, comprising a centrifugal valve unitdriven inrespons'e to engine speed and having means providing a pair ofnoncommunicating passages adapted to' be communicated, respectively andindependently, with said venturi vacuum and with said manifold vacuum,and centrifugally responsive means acting to control the independentcommunication of said respective passages with said venturi vacuum andmanifold vacuum.

12. Control structure for an engine governor responsive to enginemanifold vacuum and venturi vacuum, comprising a centrifugal valve unitdriven in response to engine speed and having means providing a pair ofinternal, non-communicating passages rotating in response to enginespeed and adapted to be communicated, respectively and independently,with said venturi vacuum and with said manifold vacuum, andcentrifugally responsive means acting to control the independentcommunication ofsaid respective passages with said venturi vacuum andmanifold vacuum.

13. Control structure for an engine governor, operating in response toventuri vacuum and manifold vacuum and including a vacuum-responsivedevice operable to control fuel supplied to the engine, said structurecomprising a centrifugal valve unit rotatively driven in response toengine speed and having means providing a pair of internal,non-communicating passages adapted to be communicated, respectively andindependently, with said venturi vacuum and with said manifold vacuum,and centrifugally responsive means acting to control the independentcommunication of said respective passages with said venturi vacuum andmanifold vacuum, and means including a valve device to control asequence of independent communications of said respective passages withsaid vacuum-responsive device.

14. Control structure for an engine governor, operating in response toventuri vacuum and manifold vacuum and including a vacuum-responsivedevice operable to control fuel supplied to the engine, said structurecomprising a centrifugal valve unit rotatively driven in response toengine speed and having means providing a pair of internal,non-communicating passages rotating in response to engine speed andadapted to 'be communicated, respectively and independently, with saidventuri vacuum and with said manifold'vacuum, and centrifugallyresponsive means acting to control the independent comunication of saidrespective passages with said venturi vacuum and manifold vacuum," andmeans including avalve device to control a sequence of independentcommunications of said passages with said vacuum-responsive device,thereby to independently operate said vacuum-responsive device undercontrol of the venturi and manifold vacuum conditions.

15. Control structure for an engine governor, operating in response toventuri vacuum and manifold vacuum and including a vacuum-responsivedevice operable to control fuel supplied to the engine, said structurecomprising a centrifugal valve unit rotatively driven in re sponse toengine speed and having means providing a pair of internal,non-communicating passages rotating in response to engine speed andadapted to be communi- 1 cated, respectively and independently, withsaid venturi vacuum and with said manifold vacuum, and centrifugally.responsive means acting to control the independent communication of saidrespective passages with said venturi vacuum and manifold vacuum, andmeans including a valve device to control a sequence of independentcommunications of said passages with said vacuum-responsive device,thereby to independently operate said vacuum-responsive device undercontrol of the venturi and rnanifold vacuum conditions, said valvedevice comprising vacuum-sensitive means in communication with andresponsive to one of said vacua, and a valve element movable by saidvacuum sensitive means to control communication between saidvacuum-responsive device and said respective venturi and manifold vacua.

16. Control structure for an engine governor, operating in response toventuri vacuum and manifold vacuum, said structure comprising acentrifugal valve unit having. a tubular shaft rotatively driven inresponse to enginespeed, means rotating with said shaft and havinginter-- nal, non-communicating passages in communication with, theinterior of said shaft, said passages being adapted to be respectivelyand independently communicated through said shaft with said venturivacuum and with said manifold vacuum, and centrifugal speed-responsiveweight. means acting to control the independent communication of saidrespective passages with said venturi vacuum: and manifold vacuum.

17. Control structure for an engine governor, operat-- ing in responseto venturi vacuum and manifold vacuum, said structure comprising acentrifugal valve unit having. a tubular shaft rotatively driven inresponse to engine speed, means rotating with said shaft and havinginternal, non-communicating passages in communication with the interiorof said shaft, said passages being adapted to be respectively andindependently communicated through said shaft with said venturi vacuumand with said mani fold vacuum, and centrifugal speed-responsive weightgal speed-responsive weight means acting to control communication ofsaid respective passages with said venturi vacuum and manifold vacuum,and means including a valvedevice to control the independentcommunication of said respective passages with said vacuum-responsivedevice and said respective venturi and manifold vacua, thereby toindependently operate said vacuum-responsive device.

19. A governor for an internal combustion engine equipped with a memberto control the flow of air to said engine, comprising pressureresponsive means operatively connected to said member to operate thesame, first means for sensing the rate of air flow to said engine,second means for sensing engine vacuum, said first and second means eachbeing operatively connected to said pressure responsive means to atditferent times position the latter, and further means operativelyconnected to engine vacuum and to at least one of said first and secondmeans to control the positioning of said pressure responsive means byone of said first and second means.

20. A governor for an internal combustion engine equipped with a memberto control the fiow of air to said engine, comprising pressureresponsive means operatively connected to said member to operate thesame, first means for sensing the rate of air flow to said engine,second means for sensing engine vacuum, said first and second means eachbeing operatively connected to said pressure responsive means to atdifferent times position the latter, and further means operativelyconnected to engine vacuum and to at least one of said first and secondmeans to control the positioning of said pressure responsive means byone of said first and second means, said further means comprising adevice having fluid pressure responsive means actuating the same whichis responsive to engine vacuum and is operatively connected to at leastone of said first and second means.

21. A governor for an internal combustion engine equipped with a memberto control the flow of air 'to said engine, comprising pressureresponsive means operatively connected to said member to operate thesame, first means for sensing the rate of air flow to said engine,second means for sensing engine vacuum, said first and second means eachbeing operatively connected to said l2 pressure responsive means to atdifferent times position the latter, and further means operativelyconnected to said first and second means and responsive to engine vacuumfor determining the periods during which said first and second means arepermitted to position said pressure responsive means, said further meanscomprising a valve device having fluid pressure responsive meansactuating the same which is responsive to engine vacuum and is connectedto said first and second means.

22. A governor for an internal combustion engine equipped with a memberto control the fiow of air to I said engine, comprising pressureresponsive means operatively connected to said member to operate thesame, first means for sensing the rate of air flow to said engine,second means for sensing engine vacuum, said first and second meansbeing each operatively connected to said pressure responsive means to atdifferent times position the latter, and further means operativelyconnected to at least one of said first and second means and responsiveto engine vacuum to control the positioning of said pressure responsivemeans by said first and second means, said further means comprising apair of devices each having fluid pressure responsive means actuatingthe same which is responsive to engine vacuum and is operativelyconnected to one of said first and second means.

23. A governor for an internal combustion engine equipped with athrottle valve for controlling the flow of air to said engine,comprising first pressure responsive means operatively connected to saidthrottle valve, second means for sensing the rate of air flow to saidengine and adapted to at times position said pressure responsive means,third means for sensing engine vacuum and adapted to at times positionsaid pressure responsive means, and further valving means connected withsaid second and third means and responsive to engine vacuum fordetermining the periods during which said second and third means arepermitted to position said pressure responsive means.

Olson Jan. 16, 1945 Mallory Feb. 11, 1947

